Improvement in mortising-chisel



stent delimita CARLHINZ, OF SAN FRANCISCO, CALIFORNIA.

Letters Patent No. 93,534, dated August 10, 1869.

IMPROVEMENT IN MORTISINGj-CHISEL.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern require a shallow mortise cut around the `main onefor the purpose of receiving the ange, or other device, by which the pulleys are attached to the timber; and consists of a mortising-chisel, having a shorter adjustable one above it, and placed far enough from it to give the desired width of shallow mortise. By adjusting the shorter chisel, any desired depth'or width of shallow mortise can be given, the whole being performed at one operation, with great accuracy and celerity. l

Io more fully illustrate and describe my invention, reference is had to the accompanyingdrawings, forming a part of this specification, of which- Figure 1 is a perspective view.

Figure 2`is a sectional elevation.

`Similar letters of reference ineach of' the figures in- .dieate like parts.

A is a mortising-chisel, having'the upper vend, E, of much greater thickness than the lower or cuttingend.

Between the stem B and the chisel is a block, C, which is l'argcr than the but-end of the chisel.

The stem is placed so that if a straight line were drawn along the front or face ofthe chisel A, and extended, it would out the stem through the centre, in order that the pressuremight be equally distributed.

D i's a short chisel, wider than A, having wings a a. on each side, forming a groove between them.

The chisel D is placed upon the face of the upper enlarge end E of the chisel A, so that the chisel A will be received in the groove between the wings, the wings passing down on each side.

The two are then secured together by a screw, b.

'Ihe hole in the chisel D, through which the screw passes, is elongated, so that the chisel may be moved up and down, as desired, in order that the chisel A may make a deeper or more shallow mortise, and still bring the chisel D to the desired depth to form the 'shallow mortise.

When it is desired to make-'the shallow mortise longer than vthe regular set of the chisels allows, the screw b can be. loosened, and strips of wood or other material placed between the two chisels, and thusremove them further apart.

With this device, I am able to out mortises for pulleys and other pieces of mechanism, byf'tlie same operation, and with the same tool, making the mcrtise of any form desired.

Having'thns described lmy invention,

What I claim, and desire to secure by Letters Patent, is-

The combination, with a mortising-chisel, A, of an adjustable chisel, D, the parts being constructed and arranged substantially as described.

In witness whereof, I have hereunto set my hand and seal.

CARLv HINZ. [In s.]

Witnesses:

G Eo. H. STRONG, J. L. Boonic. 

